The unique physical process of femtosecond laser plasma optical filament transmission in the atmosphere has important application prospects in the field of aerospace.The spectral broaden-ing characteristics of femtosecond plasma filaments are verified by simulation and experiments,and the characteristics that ultrafast plasma filaments cover the spectrum range from visible to in-frared detection system under different parameter characteristics and the system relative stability are obtained,which will have an important enlightening role for infrared detection with the spectra of intense laser plasma filaments.
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